Quote:
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full length resize and crimping
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Do
NOT crimp.
Back the seating die body off a full turn (or more), readjust the seater stem and do
NOT crimp. See if that solves your problem.
There is a very good chance your crimping step (especially if combined with seating) is collapsing/bulging the shoulder a bit, creating a slight "jam fit" that the ejection sequence can handle under pressure, but that
you notice if you try to pull the bolt back unfired.